there are more than a very few who can teach their mandarins to eat prepared foods. On MOFIB almost all the mandarins are eating prepared foods.
The way they do it is to put your mandarin in a breeding net and start by offering live brine, then mix in frozen brine, they mix in mysid and then leave out the live brine. Once you get them eating prepared foods good, then release them from the breeders net.
I think soon you will see captive bred mandarins all ready eating prepared foods on the market.
Sandy